Quieter, greener supersonic travel is the focus of eight studies selected by NASA’s Commercial Supersonic Technology Project to receive more than $2.3 million in funding for research that may help overcome the remaining barriers to commercial supersonic flight.

Rosetta’s continued close study of Comet 67P/Churyumov–Gerasimenko has revealed an unexpected process at work, causing the rapid breakup of water and carbon dioxide molecules spewing from the comet’s surface.